When I first stumbled across a trailer for it, I thought it was just gonna be Nvidia showing off what Tegra 4 can do over Tegra 3 up until they suddenly started building a controller around it! The design looks a little too square to me for a comfortable grip, even though it's obviously based right off of a 360 controller's design, but that's hard to say without knowing how big it actually is... and I'm wondering just how the whole wifi linking works. Do you link up to a PC and transfer the game from its screen to the Shield screen, which once again drags up that whole dilemma with "why would you play on the handheld when you can play on the big screen", or do you link up to a PC to treat the thing like an ordinary handheld controller?
Wonder if they're also planning to make it possible to link the controller to the TV, just to throw another leg into the fight for that space!